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ARW file in Develop Module fine but Library and exported files show banding

New Here ,
Jul 03, 2024 Jul 03, 2024

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This is a first time issue for me.  Many images from an event shoot are showing banding in the library module (noticable on suits and plain color clothing) but are fine in develop module.  Problem is that the banding shows up in the exported jpgs - looks the same as the library version, but develop module still shows the images perfectly, no banding.  Running Windows 11 Home. Please help.

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Community Expert ,
Jul 11, 2024 Jul 11, 2024

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That is a moiré effect (https://en.wikipedia.org/wiki/Moir%C3%A9_pattern) due to the pattern in the coat. It is a fundamental effect that is due to the difference in resolution between different modes of export, scaling, etc. so will show up in some places and not in others and explains why it shows up in library and not in Develop. In some cases, you might see the reverse where it is visible in develop but not in Library. This is very hard to combat but you can use the moiré slider in a brush or using an object selection on the coat. Using this slider will basically blur some of the high frequency fabric pattern detail and prevent the interference of the pattern in the coat with the pixel array in the exported images. Hope this helps.

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New Here ,
Jul 11, 2024 Jul 11, 2024

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Thank you for your response.  I don't understand the technicalities of the reason, but seems there should be a way to reconcile the resolution and scaling when exporting.  Anyway, hopefully I won't encounter it often.  I understand about banding and moire caused by flickering artificial lighting when using silent shutter etc., but this was a new one.

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Community Expert ,
Jul 11, 2024 Jul 11, 2024

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This just happens anytime two regular grids of lines or squares overlay each other and they are slightly rotated or of different frequency. It is a natural consequence of this and very common and not unique to photography at all. You see this for example if you have bug screen for a french sliding door in your home and you overlay two of the bug screen panels by sliding one over the other. You can't completely avoid it except for using higher resolution displays where the individual pixels are not visible to your eyes and always exporting to high enough resolution so that you're above the frequency at which you get interference effects.  

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